Home / 7,128.12-9,836.79-3,984.31

Finding the Fourth Proportional to 7,128.12, 9,836.79 and 3,984.31

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Solution

The fourth proportional to 7,128.12, 9,836.79 and 3,984.31 is: 5,498.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128.12 : 9,836.79 = 3,984.31 : x
  2. Step 2: Convert to fraction form
    7,128.12/9,836.79 = 3,984.31/x
  3. Step 3: Cross multiply
    7,128.12x = 9,836.79 × 3,984.31
  4. Step 4: Simplify right side
    7,128.12x = 39,192,820.76
  5. Step 5: Solve for x
    x = 39,192,820.76/7,128.12
  6. Step 6: Final answer
    x = 5,498.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.